Fixed different bugs that prevented successful build and deployment

- Previously, the build scripts did not create the apk file. Now, "rake
  build" will create the apk by going through the entire maven build
  lifecycle (including running tests).

- Invoking "rake build-tests" now runs a clean and will recompile tests
  every time it is invoked.

- Commented out "state" code from NoteActivity; not in use

- Android target APK has been set to 19

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>